docs: def postal_code(random=random, *args, **kwargs):
      """
      Produce something that vaguely resembles a postal code
  
      >>> mock_random.seed(0)
      >>> postal_code(random=mock_random)
      'b0b 0c0'
      >>> postal_code(random=mock_random, capitalize=True)
      'E0E 0F0'
      >>> postal_code(random=mock_random, slugify=True)
      'h0h-0i0'
  
      """
      return random.choice([
          "{letter}{number}{letter} {other_number}{other_letter}{other_number}",
          "{number}{other_number}{number}{number}{other_number}",
          "{number}{letter}{number}{other_number}{other_letter}"
      ]).format(
          number=number(random=random),
          other_number=number(random=random),
          letter=letter(random=random),
          other_letter=letter(random=random)
      )